Combustion detector



FIG. 1 is a top view of the combustion detector showing my new design,

FIG. 2 is a side view of the combustion detector of FIG. 1. The side view is substantially the same viewed from any position around the detector,

FIG. 3 is a perspective view of the combustion detector of FIG. 1 as viewed from the left side, and

FIG. 4 is a bottom view of the combustion detector. 

The ornamental design for a combustion detector, substantially as shown and described. 